linux-kernel - Re: [PATCH 5/6] MN10300: Add the MN10300/AM33 architecture to the kernel [try #5]

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Date:	Sat, 10 Nov 2007 20:09:35 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Howells <dhowells@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, dhowells@...hat.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-am33-list@...hat.com
Subject: Re: [PATCH 5/6] MN10300: Add the MN10300/AM33 architecture to the
 kernel [try #5]

> The vast majority of which are either memory-mapped hardware registers or
> interrupt-routine-filled ring buffers.

memory mapped registers should be read with readw and friends and that
should contain the volatile not the public code.

Similarly spin_lock/unlock are store barriers so for ring buffers should
be sufficient unless you have cache management requirements in which case
the dma_* APIs will handle those bits.

Knocking these sort of things on the head does want doing, we are still
having to clean up ancient drivers/platforms that don't do this and
frequently break as a result.

> | WARNING: do not add new typedefs
> | #27265: FILE: include/asm-mn10300/types.h:30:
> | +typedef unsigned int __u32;
> 
> Pah!

Send bugs to the maintainer. You've triggered a new case - adding an arch
and it gets the wrong idea.

> 
> | #29191: FILE: include/asm-mn10300/user.h:50:
> | +#define HOST_TEXT_START_ADDR +(u.start_code)
> |                               ^
> |
> | ERROR: need consistent spacing around '+' (ctx:WxV)
> 
> Doesn't checkpatch know a unary plus when it sees one?

No - its rather dumb on rule handling and will need a rewrite someday to
handle typedefs as well.

> 	#1269: FILE: arch/mn10300/boot/compressed/head.S:38:
> 
> Should be:
> 
> 	arch/mn10300/boot/compressed/head.S:38:
> 
> Yes, I know there's a --emacs flag, but that only affects references into the
> patch, not references into the files the patch refers to.

Send patches...

Alan
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